improved android client, feature parity with desktop

android/app/src/main/res/drawable/ic_notification_stream.xml

@@ -0,0 +1,13 @@
+<!--
+  The status-bar glyph. Android tints small icons to a single colour and drops
+  everything that is not opaque, so this is the launcher mark reduced to one
+  white silhouette rather than the two-tone drawable.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp" android:height="24dp"
+    android:viewportWidth="24" android:viewportHeight="24">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:fillType="evenOdd"
+        android:pathData="M4,4h16v16h-16zM10,8.5l5.5,3.5 -5.5,3.5z" />
+</vector>